R80ST and R80g/s front wheel question

Discussion in 'Airheads' started by sigpe57, Oct 5, 2012.

  1. sigpe57

    sigpe57 Been here awhile

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    I have an extra 19" r80st wheel. If I ask the wheel builder to put on a new 21" rim plus longer spokes, will the new wheel be exactly the same as a '21 r80g/s wheel?

    After that, if I put this newly build wheel on a R80ST, will this R80ST have the exactly same suspension setup as an R80g/s? I will also replace the shock with a r80g/s shock, of course.

    Thank you for the reply,

    TT
    #1
  2. villageidiot

    villageidiot Long timer

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    id say do whatever feels good and makes you happy
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  3. scarygary

    scarygary Drawing blanks

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    The front suspension is different on the two bikes. The G/S is longer. The triple clamp and top brace are the same so the swap is quite easy.

    ST front with 19"
    [​IMG]

    G/S front with 21"
    [​IMG]
    #3
  4. Chad M

    Chad M Custom User Title

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    Yes, what ScaryGary said... check out the location of the axle on the front wheel.
    #4
  5. England-Kev

    England-Kev Long timer

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    You would also need the brake caliper, as the ST one is different from a G/S
    #5
  6. kbasa

    kbasa Roubaix! Super Moderator

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    Perhaps you're aware of the Airheads forum above?

    Please post airhead threads in the airhead forum. Thanks.

    One of the OS Mods,

    kbasa
    #6
  7. Mark Manley

    Mark Manley On my way

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    The caliper on the paralever 80/100GS is different but I think the S/T and monolver G/S have the same caliper
    #7
  8. Boxer Metal

    Boxer Metal Mad Scientist

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    The answer to the first question is Yes and the brake disc is the same as well.
    Answer to the 2nd question. You can look in the Clymer or Haynes manual to see what the suspension travel is between the G/S and the R80ST or R65.

    Some one made reference to the brake caliper which should not make a difference in you application.
    The G/S has the same offset and mounting pattern as any 81-84 R80 or R100. The R80ST as a further apart mounting pattern than above just like the R65 and a different offset. The R100GS is a lager piston and different offset than any of the to mentioned above.

    If all you are doing is lacing a 21" rim to your ST then there is nothing to change. The lower fork legs on the ST are the same as the R65 from 79-84 with the axle located at the bottom of the fork slider. A 21" front wheel will make the bike handle quicker. You will to address the R80ST fender brace. The 21" front wheel is to tall I believe.
    #8
  9. Clay Spinner

    Clay Spinner Been here awhile

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    AS above, caliper from a g/s will not fit on an st... the mounting holes are further apart. However the ST mounting points are the same as the r100gs and will therefore accept the brembo caliper from the r1100gs, with a slight bit of machining on the tabs..I think you need to take of 0.158 inches but its worth checking.. you'll have a very good front end. I have that setup on my ST and the front brakes are great... on the g/s...not so good!
    #9